Base-frame for absorbing vibration or tremor.



No. 682,l04. Patented Sept. 3, l90l. G. MIDDLETON. BASE FBAIE FOB ABSOBBIIG VIBRATION 0B TREIOR.

(Appliution flied In, 18, 1901.

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N0. 682,")4. Patented Sept. 3, l90l. G. MIDDLETON.

BASE FRAIE FOR ABSORBING VIBRATION 0R TREMOR.

(Application med m 13, 1901. (No Model.) 2 Sheets-Sheet 2.

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UNITED STATES PATENT OFFICE.

GEORGE MIDDLETON, OF LONDON, ENGLAND.

BASE-FRAME FOR ABSORBING VIBRATION OR TREMOR.

SPECIFICATION forming part of Letters Patent No. 682,104, dated September 3, 1901. Application filed May 13, 1901. Serial No. 60,089. (No model.)

To all whom it may concern-.-

Be it known that I, GEORGE MIDDLETON, carriage-builder, a subject of the King of Great Britain, residing at 16 Fanthorp street, Lower Richmond road, Putney, London, England, have invented certain new and useful Improvements in Base-Frames for'Absorbing Vibration or Tremor, of which the following is a specification.

The object of my invention is to construct supports for gas, oil, electric, or other motors, dynainos, and other machinery or apparatus which is subject to or liable to produce or set up vibratory movements in such manner that the vibrations and tremors are absorbed there by, thus insulating the machinery (so far as the communication of Vibration is concerned) from the building or erection in or on which the machinery is situated.

According to my invention I construct a base-frame of two or more superposed frames (preferably formed of wood) which are fitted with intermediate springs as supports, the whole arranged and constructed in such a manner that there is no substantially rigid contact between the machine and the building. The strength or supporting-power of the springs is regulated according to the weight they have to carry, so that a practically steady but floating support is obtained thereby; and in order that my said invention may be particularly described and as-' certained I will now describe my invention as applied to an electric motor.

Reference is made to the accompanying drawings,in which similar letters of reference indicate corresponding parts and which are only intended as illustrative of the principle upon which my invention is based.

Figure 1 is an elevation of an antivibration base-frame constructed in accordance with my invention, to which an electric motor is shown attached. Fig. 2 is an end elevation of same. Fig. 3 is a plan of a portion of the base-frame.

a is the frame, which may be of any suitable size and shape and capable of being fixed to suitable foundations.

b is a frame, preferably of similar size and shape to the frame a. The frame Z) is shown supported by two or more semi-elliptic springs c, which are secured at c to the lower frame a and at Z) to scroll-irons or the like Z2 fixed to the frame 1). One end of the spring is fitted with a shackle or link b intervening between the spring and the scroll-iron. Auxiliary springs d or other elastic connections and (or) safety-blocks d are provided when desirable to prevent excessive oscillation or inclination of the upper frame I) through breakage or other cause, such elastic connections being fitted with means for tensioning same.

6 is a base to which the motorf is rigidly attached. This base 6 may be of solid construction, as shown, or it may be formed as a frame. It is adjustably mounted upon the upper frame l) in order to balance the motor and to provide for the strain or weight of a belt or the like. As shown in Figs. 1 and 3, this adjustment, which must be rigid when set, may be accomplished by slots 6 and bolts and nuts (2 or by means of screw-clamps a or screw-rods e and nuts 6 fixed to the base 6. Any other suit-able means of adjustment may be used for moving and fixing the base 6, as will be understood.

The design and construction of the frame and the type or description and the number of springs may be modified according to requirements. Also the frames maybe formed of material other than wood, such as metal or a combination of wood therewith. For example, the motor of a road-vehicle would preferably be suspended or hung from the under side of the base e' and within the frames (0 and b, the frame a being securely attached to or forming part of the under carriage or frame or other suitable part of the vehicle. The springs of the base-frame are supplementary to and not instead of the usual axlesprings. The semi-elliptic springs shown at c are built up according to'the weight to be supported, as would also be the case were elliptic or C springs employed. Such types of laminated springs or single-curved spring-plates preserve the transverse stability of the upper frame I; and permit of a limited amount of oscillation in the direction of rotation of the machine; but it is necessary with elliptic, semi-elliptic, and analogous shaped springs to fit a shackle, link, or similar device at one end in order to allow for the draw of the spring. Thus with elliptic springs the shackle or the like would be fitted at one end of the spring between the extremities thereof, and with semi-elliptic springs the shackle or the like would be fitted between one end thereof and a scroll iron or analogous fitting attached to the frame. WVhere two or more springs are used on each side, the shackle or other loose jointed ends are all arranged at equivalent ends-2'. e., all right-handed, or vice versa-so that the springs all act in the same direction; otherwise the action of the springs would become locked. Also in applying motors which have a horizontal inertia when in action the direction of the outward stroke is preferably arranged toward the fixed ends of the springs. In some cases inorder to establish equilibrium it may be necessary to fit one or more springs at one or both ends of the frame, the extremities of the springs being so connected to the frame as to allow for the draw of the spring or springs and the slight transverse motion of the frame relatively thereto.

Preference is given tosprings of the type of carriage-springs or springs which act in tension, as the resilence thereof is not so harsh as with springs in-compression. In all cases it is necessary to adjust the power of the springs so as to provide a steady but floating support for the upper frame, which car ries the motor or machinery.

I claim- 1. A base-frame for absorbing vibration or tremor, consisting of superposed frames fitted with intermediate springs and safetyblocks, substantially as and for the purpose set forth.

2. A base-frame for absorbing vibration or tremor, consisting of superposed frames fitted with intermediate springs, and a base to which the motor or machinery is attached, substantially as set forth.

3. In a base-frame, the combination, with superposed frames, of springs arranged between said frames, and fitted with skackle or equivalent ends to permit of the draw of the springs, substantially as set forth.

4. In a base-frame the combination with superposed frames,of semi-elliptic springs arranged between said frames, one end of each spring being pivotally fixed and the other end shackled or linked, substantially as set forth.

5. In a base-frame, the combination, with superposed frames fitted with intermediate springs, of the means described for preventing excessive oscillation or inclination of the supported frame, substantially as set forth.

6. In a base-frame, the combination with superposed frames, of springs suitably connected thereto to form a floating support, and

safety-blocks for the said floating support.

7. In abase-frame, the combination, with superposed frames, of springs of the carriage or laminated type arranged between said frames, and means for pivoting and shackling the ends of the said springs substantially as set forth.

8. In combination, superposed frames, springs connected to the lower of said frames, means for pivotally connecting one end of said springs to the upper of said frames, means for shackling the opposite end of said springs to the upper of said frames, and an adjustable base mounted. upon said upper frames.

9. In combination, superposed frames, springs connected to the lower of said frames,

means for pivotally connecting one end of the said springs to the upper of said frames, means for shackling the opposite .end of said springs to the upper of said frames, auxiliary springs interposed between the said frames, and an adjustable base mounted upon the upper of said frames.

10. In combination, superposed frames, springs interposed between the said frames,

means for pivoting one end of the said springs to the upper of said frames, means for shackling the opposite end of said springs to the upper of said frames, auxiliary springs interposed between the said frames, safety-blocks interposed between the said frames,and a base mounted upon the upper of said frames.

11. In combination, superposed frames, springs interposed between the said frames, means for pivoting one end of the said springs to the upper of said frames, means for shackling the opposite end of said springs to the upper of said frames, auxiliary springs interposed between the said frames, safety-blocks interposed between the said frames, a base mounted upon the upper of said frames, and means to permit of the adjusting of said base.

12. In combination, superposed frames,

springs interposed between the said frames and suitably connected to the upper of said frames, safety devices interposed between the said frames, and an adjustable base mounted upon the upper of said frames.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

GEORGE MIDDLETON.

Witnesses:

GEORGE O. DOWNING, WALTER J. SKERTEN. 

